package com.briup.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.briup.reggie.common.BaseContext;
import com.briup.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    private static final AntPathMatcher PATH_MATCHER =  new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String RequestURI = request.getRequestURI();

        //定义不需要处理的数据
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //2.判断本次请求是否处理
        boolean check = check(urls, RequestURI);

        //3.如果不需要处理，直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

        //4-1.判断用户是否登录,如果登录直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id:{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断用户是否登录,如果登录直接放行(移动端)
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id:{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        //5.如果未登录，返回未登录结果，通过输出流向客户端页面响应数据
        //因为这个是过滤器，所以返回一个R，并不能直接解析为json
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    /**
     * 路径匹配,检查本次请求是否放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
